The death toll climbed to six people on Friday after the corner section of a nine-storey residential building collapsed in the provincial city of Izhevsk, officials said. “There are three injured and six dead,” said the health ministry in the Udmurtia region of which Izhevsk is the capital.

The sixth body was discovered earlier on Friday, an emergencies ministry official said.”A woman has been found in the building’s basement,” the official said, adding that a search and rescue operation continued. At least one of the six victims was a child, officials said.

The incident happened on Thursday when a corner section of the Soviet-era residential block collapsed after what was believed to be a gas explosion, as reported by AFP.

Video footage showed flats on all nine floors reduced to debris. A total of eight apartments are believed to be completely destroyed.

More than 200 rescuers have been involved in the search for survivors. Izhevsk, which is home to some 650,000 people, is located some 940 km east of Moscow. Explosions caused by gas leaks are frequent in Russia, especially in older Soviet-era buildings.